CN102255398B - Wireless electromagnetic energy transfer method and device - Google Patents
Wireless electromagnetic energy transfer method and device Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
- B60L53/126—Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0064—Magnetic structures combining different functions, e.g. storage, filtering or transformation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/01—Resonant DC/DC converters
-
- H04B5/79—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The electromagnetic energy transfer device includes a first resonator structure receiving energy from an external power supply. The first resonator structure has a first Q-factor. A second resonator structure is positioned distal from the first resonator structure, and supplies useful working power to an external load. The second resonator structure has a second Q-factor. The distance between the two resonators can be larger than the characteristic size of each resonator. Non-radiative energy transfer between the first resonator structure and the second resonator structure is mediated through coupling of their resonant-field evanescent tails.
Description
The application is to be on July 5th, 2006 applying date, is entitled as " wireless non-radiative energy transmission ", and application number is dividing an application of 200680032299.2 patent application.
Priority information
The application requires the priority of the provisional application No.60/698442 of submission on July 12nd, 2005, and it all is incorporated herein as a reference.
Technical field
The application relates to the field of vibration resonance electromagnetic mode, relates in particular to the vibration resonance electromagnetic mode with local slow evanescent field pattern that is used for the wireless non-radiative energy transmission.
Technical background
Electromagnetic early stage, dispose before the electric wire electric power transmission network, people drop into a large amount of enthusiasm and make great efforts research and development and do not have the energy-delivering scheme of line length distance without any need for carrier medium.These effort seem to obtain seldom achievement.The radiation mode of omnidirectional antenna is very effective for information is transmitted, but is not suitable for this energy delivery, this be because most energy dissipations in free space.(transmit distance L even use the directed radiation pattern of laser and highly-directional antenna can be used for long distance expeditiously
TransmitL
Equipment, L wherein
EquipmentBe the characteristic size of equipment) energy delivery, but under the situation of mobile object, need to exist the sight line that can not interrupt and complicated tracking system.
The fast development of autonomous electronic equipment in recent years (for example, laptop computer, cell phone, family expenses automaton, they all rely on chemical energy storage usually) provides the needs that restudy this problem.Today, existing network of wires almost delivers energy anywhere, even the wireless non-radiative energy transmission of middle distance also is very useful.A current scheme that is used for some important application relies on electromagnetic induction, but this scheme is limited to very closely (L
Transmit<<L
Equipment) energy delivery.
Summary of the invention
According to an aspect of the present invention, provide a kind of electromagnetic energy transfer device.This electromagnetic energy transfer device comprises first resonator structure that is used for from the external power source received energy.First resonator structure has first quality factor (Q-factor).Second resonator structure is positioned at the position away from first resonator structure, to the available operating power of external loading supply.This second resonator structure has second quality factor.Distance between these two resonators can be greater than the characteristic size of each resonator.By the resonant fields fadout trace (tail) of be coupled first resonator structure and second resonator structure, realize the non-radiative energy transmission between first resonator structure and second resonator structure.
According to another aspect of the present invention, provide a kind of electromagnetic energy transfer method.This method comprises first resonator structure that is provided for from the external power source received energy.First resonator structure has first quality factor.This method also comprises second resonator structure, and it is positioned at the position away from first resonator structure, to the available operating power of external loading supply.This second resonator structure has second quality factor.Distance between these two resonators can be greater than the characteristic size of each resonator.In addition, this method comprises that the resonant fields fadout trace by be coupled first resonator structure and second resonator structure transmits non-radiative energy between first resonator structure and second resonator structure.
According to another aspect of the present invention, provide a kind of method of wireless transmission electromagnetic energy, having comprised:
Be provided for first resonator structure from the external power source received energy, described first resonator structure has first quality factor q
1, and,
Second resonator structure is being provided and is supplying available operating power to external loading away from the position of described first resonator structure distance for D, described second resonator structure has second quality factor q
2,
The coupling of the resonant fields fadout trace by described first resonator structure and described second resonator structure is transmitted non-radiative energy between described first resonator structure and described second resonator structure,
Wherein, described first resonator structure is for low inherent loss speed Γ
1Use has high Q
1=ω
1/ (2 Γ
1) resonance mode be used for the non-radiative energy transmission, described second resonator structure is for low inherent loss speed Γ
2Use has high Q
2=ω
2/ (2 Γ
2) resonance mode be used for non-radiative energy transmission, ω
1And ω
2Be respectively the resonance frequency of described first resonator structure and the resonance frequency of described second resonator structure, and
Wherein, described distance D is less than the resonant wavelength λ of described first resonator structure
1Resonant wavelength λ with described second resonator structure
2
According to another aspect of the present invention, provide a kind of electromagnetic energy wireless transmission equipment, having comprised:
Be used for first resonator structure from the external power source received energy, described first resonator structure has first quality factor q
1, and use with second resonator structure,
Described second resonator structure is provided with in the position that is D away from described first resonator structure distance and to the available operating power of external loading supply, described second resonator structure has second quality factor q
2,
Wherein, the non-radiative energy transmission between described first resonator structure and described second resonator structure is to be undertaken by the coupling of their resonant fields fadout trace,
Wherein, described first resonator structure is for low inherent loss speed Γ
1Use has high Q
1=ω
1/ (2 Γ
1) resonance mode, described second resonator structure is for low inherent loss speed Γ
2Use has high Q
2=ω
2/ (2 Γ
2) resonance mode be used for non-radiative energy transmission, ω
1And ω
2Be respectively the resonance frequency of described first resonator structure and the resonance frequency of described second resonator structure, and
Wherein, described distance D is less than the resonant wavelength λ of described first resonator structure
1Resonant wavelength λ with described second resonator structure
2
According to another aspect of the present invention, provide a kind of electromagnetic energy wireless transmission equipment, used with first resonator structure from the external power source received energy, described first resonator structure has first quality factor q
1, described energy wireless transmission equipment comprises:
Second resonator structure is provided with in the position that is D away from described first resonator structure distance and to the available operating power of external loading supply, described second resonator structure has second quality factor q
2,
Wherein, the non-radiative energy transmission between described first resonator structure and described second resonator structure is to be undertaken by the coupling of their resonant fields fadout trace,
Wherein, described first resonator structure is for low inherent loss speed Γ
1Use has high Q
1=ω
1/ (2 Γ
1) resonance mode, described second resonator structure is for low inherent loss speed Γ
2Use has high Q
2=ω
2/ (2 Γ
2) resonance mode be used for non-radiative energy transmission, ω
1And ω
2Be respectively the resonance frequency of described first resonator structure and the resonance frequency of described second resonator structure, and
Wherein, described distance D is less than the resonant wavelength λ of described first resonator structure
1Resonant wavelength λ with described second resonator structure
2
Description of drawings
Fig. 1 shows the schematic diagram of explanation an illustrative embodiment of the invention;
Fig. 2 A is that the radius with electric field is the numerical value FDTD result of high target (index) circular disk cavity of r; Fig. 2 B is the numerical value FDTD result at the middle distance coupling between two resonance circular disk cavity: initial, all energy are in a chamber (left side), and after the certain hour, two chambeies are by excitation (right side) equally.
Fig. 3 shows the schematic diagram of the conductor loop of two capacity loads;
Fig. 4 A and 4B are the numerical value FDTD results who reduces at the radiation Q that causes the resonating disk chamber owing to the scattering from external object;
Fig. 5 is at the numerical value FDTD result who has under the situation of external object the middle distance coupling between two resonating disk chambeies;
Fig. 6 A and 6B show as being coupled-arriving-k/ Γ
dFunction, the confession power transfer is become the efficient (η of useful work
w), the radiation at equipment place and the efficient (η of ohmic loss
d), the radiation at source place and the efficient (η of ohmic loss
s) and the efficient (η of the dissipation of inside of human body
h); In figure (a), select Γ
wWith the energy of storing in the minimization device, in figure (b), select Γ
wTo maximize for each k/ Γ
dEfficiency eta
w
Embodiment
Than existing scheme, the invention provides the vibration resonance electromagnetic mode that uses longevity and carry out the feasibility that wireless non-radiative energy transmits with local slow evanescent field pattern.The basis of this technology is that the resonant object of two same frequencys trends towards coupling, and faintly interacts with other off-resonance environmental objects.The objective of the invention is to use object lesson to quantize this mechanism, that is, solve following problem quantitatively: this scheme is efficient in which type of distance range, and for the sensitiveness of external disturbance how this scheme.In fact detailed theory and numerical analysis show can obtain middle distance (L
Transmit≈ limited quantity * L
Equipment) wireless energy exchange, and have only energy delivery seldom and be dissipated in other off-resonance object.
The omnidirectional near field but stable (lossless) characteristic makes this mechanism be suitable for mobile radio receiver.Thereby can have multiple possible application form, for example comprise: will be placed on the ceiling of factory room with the source that wired electrical network is connected, and in the room, move freely such as the equipment of automaton, vehicle, computer etc.Other possible application comprise electric engine bus, RFID and even might be nanometer robot.
The distance range (range) and the speed (rate) of the wireless energy transfer scheme of this innovation are primary investigation themes, and do not consider that also deriving energy from this system is used for work.Be used for that the suitable analytical framework of energy exchange is the weak coupling method that is called " coupled-mode theory (coupled-mode theory) " between the modeling resonant object.Fig. 1 is the schematic diagram that general description of the present invention is shown.The present invention uses source and equipment to carry out energy delivery.Source 1 and equipment 2 all are resonator structure, and the distance D that is separated from each other.In this layout, the electromagnetic field of the system of source 1 and equipment 2 is approximately F (r, t) ≈ a
1(t) F
1(r)+a
2(t) F
2(r), F wherein
1,2(r)=[E
1,2(r) H
1,2(r)] be the eigenmodes of source 1 and equipment 2 respectively, so can use amplitude a
1(t) and a
2(t) satisfy " coupled-mode theory ":
Wherein, ω
1,2Be respectively eigenfrequency, Γ
1,2Be because the resonance width that intrinsic (absorption, radiation etc.) loss of object causes, k
12,21Be coupling coefficient, k
11,22Modeling is because the skew of the combination frequency of each object that the existence of another object causes.
In most of the cases, the method for shown formula 1 provide to have similar complex eigen frequency (that is, | ω
1-ω
2|<<| k
12,21| and Γ
1≈ Γ
2) the good description of covibration of object, their resonance is by fine definition (that is Γ, reasonably
1,2﹠Im{k
11,22}<<| k
12,21|) and be restricted to weak coupling (that is, | k
12,21|<<ω
1,2).Coincidence be that these require also to allow to optimize the energy delivery operation.Formula 1 also shows at strictness resonance (ω
1=ω
2And Γ
1=Γ
2) down energy exchange almost be perfectly, and when " coupling time " loss minimum during much smaller than all " loss time ".Therefore, the present invention need be for low inherent loss speed Γ
1,2Have the resonance mode of high Q=ω/(2 Γ), and have characteristic size L more than two objects
1And L
2The long close coupling speed that is used on big distance D | k
12,21| the fadout trace, wherein D is two minimum distances between the object.This is a career field that is not widely studied (regime), because people prefer utilizing short trace to minimize interference with near equipment usually.
The almost unlimited object that extends such as dielectric waveguide can be supported guided mode, and the fadout trace of guided mode is when being tuned to when approaching to end on away from the direction of object exponential damping lentamente, and can have almost unlimited Q.In order to realize energy delivery scheme of the present invention, such geometry may be suitable for some to be used, but common limited object, promptly the object that is everywhere surrounded by air on topology is more suitable.
Unfortunately, the object of limited extension can not be supported in the air electromagnetic states of exponential damping on all directions, because in free space:
Therefore, can see that they can not support the state of unlimited Q.Yet, can find very long-lived (so-called " high Q ") state, their trace demonstrates the decay of the required similar index that begins from resonant object before in they vibrations (radiation) on sufficiently long distance.The interface that this activity change takes place is called " radiation caustic surface (radiation caustic) ", and for the wireless energy transfer scheme based near field rather than far away/radiation field, the distance between objects of coupling must make an object in the radiation caustic surface of another object.
The present invention has generality, and the resonant structure that satisfies any kind of above-mentioned requirements may be used to realization of the present invention.As the example that is used to offer some clarification on, can select to utilize two known but very different electromagentic resonance systems comes work: the conductor loop of dielectric disks and capacity load.Even without optimization, and do not consider their simplification, will see that these two kinds of system demonstrations go out good performance yet.Their difference mainly is because the suitable frequency range difference that causes of actual Consideration, for example because the electric conducting material loss is higher, thus in optical field more popular use dielectric.
Consider the 2D dielectric disks chamber (cavity) with radius r and DIELECTRIC CONSTANT by the air encirclement shown in Fig. 2 A, it supports whispering gallery (shispering-gallery) pattern of high Q.Operational analysis modeling and have the detailed numerical finite difference time domain (FDTD of resolution 30pts/r, finite-difference-time-domain) this chamber is studied in emulation, and wherein analysis modeling is all separates the variable in the circular cylindrical coordinate and the application boundary condition in this way.Notice that the physical phenomenon under the 3D situation should not have a great difference, and complicated degree of analysis and numerical value require and will greatly increase.These two kinds of methods obtain good consistent for multiple geometry and concern parameter at the result of the field pattern of complex eigen frequency and so-called " leakages " eigenmodes each other.
Be used for determining stiffness of coupling k ≡ | k
12|=| k
21| the radial mode attenuation length on the magnitude of wavelength, therefore,, need the resonant object (r of the long size of wavelet for occurring in distance between the chamber greater than the near field of the coupling between the chamber of their size<<λ).When big in fact as far as possible and (main number m's) field, orientation changed very slow (that is, m is very little) when DIELECTRIC CONSTANT, the wavelet that can obtain high radiation Q and long trace is long to resonate.
Fig. 2 A shows such TE polarized dielectric chamber pattern, and it has the superperformance Q of use ε=147.7 and m=2
Radiation=1992 and λ/r=20, this TE polarized dielectric chamber pattern will be " test " chamber 18, be used for all subsequent calculations of such resonant object.Suitably another example in chamber has the Q of use ε=65.61 and m=3
Radiation=9100 and λ/r=10.It is unpractical big that these values of ε may seem at first.Yet, not only in microwave regime (being applicable to a meter range coupling application), exist many kinds to have sufficiently high dielectric constant and low-loss material, for example, titanium dioxide: ε ≈ 96, Im{ ε }/ε ≈ 10
-3, barium tetratitanate: ε ≈ 37, Im{ ε }/ε ≈ 10
-4, lithium tantalate: ε ≈ 40, Im{ ε }/ε ≈ 10
-4Or the like, and ε can also represent other known wavelets long (λ/r〉〉 1) efficiency index of surface wave system is such as the efficiency index of the lip-deep surface plasma pattern of metalloid (negative ε) material or inter metal dielectric photonic crystal.
For absorbed, the typical loss tangents in the microwave (for example, those that list in the last flooring) suggestion Q
Absorb~ε/Im{ ε }~10000.Merge the effect of radiation and absorption, top analysis hints out the resonance device object d for suitable design, should acquisition value Q
d~2000.But notice, source of resonant excitation s is normally fixed in the reality, and loose many of restriction in the device design are compared in the restriction of geometry that it allowed and size usually, therefore, it is insignificant can reasonably supposing radiation loss can be designed to, and allows only by absorbing Qs~10000 that limit.
Now, in order to calculate obtainable rate of energy transfer, two chambeies 20,22 can be arranged to as Fig. 2 B between their center at a distance of D.So, the normal mode of this combined system is the odd even stack of originate mode, and their frequency by coupling coefficient k separately, and that we want to calculate is exactly coupling coefficient k.Analytically, coupled-mode theory has provided for dielectric objects
ε wherein
1,2(r) represent except background dielectric (free space) dielectric function of independent object 1 or independent object 2, the dielectric function in the whole space that two objects of ε (r) expression all exist.On the numerical value, by encouraging one of them chamber and calculating energy delivery time in another chamber, perhaps the normal mode frequencies by determining to be separated can use FDTD emulation to find k.For this " test " circular disk cavity, the radius r of radiation caustic surface
CBe r
C≈ 11r, and for non-radiative coupling D<r
CThereby, can select D/r=10,7,5,3 here.So, be strange pattern for the line of Fig. 3 with respect to connecting two chambeies, the prediction of analysis is ω/2k=1602,771,298,48, and the prediction of numerical value is ω/2k=1717,770,298,47, so these two kinds of method consistency are fine.The radiation field of these two initial cavity patterns is grown mutually with amplitude according to their relative phase or is interfered mutually with disappearing, cause net radiation loss that increase or minimizing respectively, thereby for any chamber distance, the strange normal mode of even summation has a phenomenon that does not capture less than the Q(coupled-mode theory of initial single chamber Q=1992 greater than initial single chamber Q=1992 and respectively), but average Γ always is approximately Γ ≈ ω/2Q.Therefore, corresponding coupling-loss ratio is k/ Γ=1.16,2.59,6.68,42.49, though they do not fall into identical operations field k/ Γ〉〉 1, resulting value is still enough big, is enough to be used in practical application.
As shown in Figure 3, consider ring 10 or 12, the lead loop that it has N radius is r, radius is to be surrounded by air in the circular cross-section of a.This lead has inductance L=μ
0N
2R[ln (8r/a)-2], μ wherein
0Be the magnetic permeability of free space, therefore this lead be connected to capacitor C and will make this ring in frequency
The essence of resonance is the periodicity energy exchange in the magnetic field in the free space that produces from the electric field of the capacitor inside that capacitor voltage at both ends produces to the electric current the electric wire.Loss in this resonator system comprises ohmic loss in the electric wire and the radiation loss in the free space.
For non-radiative coupling, should use the near-field region, its scope is roughly set by wavelength X, thus preferred field operation be encircle very little (r<<λ) situation.In this restriction, the resistance that is associated with these two loss passages is respectively
And R
Radiation=π/6 η
0N
2(ω r/c)
4, wherein ρ is the resistivity of electric wire material, η
0≈ 120 π Ω are impedances of free space.The quality factor of so this resonance are Q=ω L/ (R
Ohm+ R
Radiation), and be the highest for certain frequency of determining by system parameters: at lower frequency, it is leading by ohmic loss, and is at upper frequency, leading by radiation.
In order to obtain the rough estimate in the microwave, can use (N=1) copper coil (ρ=1.69 * 10
-8Ω m), then, for r=1cm and a=1mm, for example be suitable for cell phone, quality factor arrive peaking Q=1225 when f=380MHz, for r=30cm and a=2mm, be suitable for portable computer or family expenses automaton, Q=1103 when f=17MHz can be a source ring on the room ceiling for r=1cm and a=4mm(), Q=1315 when f=5MHz.So generally speaking, desired quality factor are at λ/r ≈ 50~80 o'clock Q ≈ 1000~1500, promptly are suitable for the near field coupling.
As shown in Figure 3, the rate of energy transfer of its center between two of D rings 10 and 12 by
Provide, wherein M is the mutual inductance of two rings 10 and 12.At restrictive condition r<<D Under the<<λ, can use quasi-stable state M=π/4 μ as a result
0N
1N
2(r
1r
2)
2/ D
3, this means
For example, by selecting D/r=10,8,6 once more, for r=1cm(with previously used identical) two rings, can obtain ω/2k=3033,1553,655 respectively, for r=30cm, ω/2k=7131,3651,1540 can be obtained respectively,, ω/2k=6481,3318,1400 can be obtained respectively for r=1m.Corresponding coupling-loss ratio reaches at monocycle Q on the frequency of peak value and reaches peak value, for three kinds of lopps types with apart from being respectively k/ Γ=0.4,0.79,1.97,0.15,0.3,0.72, and 0.2,0.4,0.94.An example of different rings is that r=1m(is in the source on the ceiling) ring and the family expenses automaton of r=30cm(on the floor) ring, they are at a distance of D=3m(room height), on f=6.4MHz, reach peak value
It is between the peak value of each Q.In addition, these are worth not at best field k/ Γ〉〉 in 1, but can see that they are enough.
Recognize that importantly this inductive scheme and the already used closely difference between the inductive scheme that is used for energy delivery are that those schemes are off-resonance.Use coupled-mode theory, can must find out easily, by geometry that keeps the source and the energy of wherein storing is fixing, the resonance coupling inductive scheme of current proposition is compared with traditional off-resonance scheme, allow Q to increase about 1000 times of the energy that the equipment of being delivered to is used for work, this is the reason that may realize the middle distance energy delivery why now.In fact the conducting ring of capacity load is widely used as resoant antenna (for example in cell phone), but these conducting rings are operated in the field, far field of r/ λ~1, and radiation Q is had a mind to the very little of design so that the antenna high efficiency, so they are unsuitable for energy delivery.
Obviously, the success based on the wireless energy transfer scheme that resonates of this innovation mainly depends on the robustness of object resonance.Therefore, they are another aspect of the needs analysis of proposed scheme for the sensitiveness near any off-resonance external object that exists.The interaction of external object and resonant object can obtain by the coupled-mode theory model in the modification formula (1), because external object does not have the resonance of good definition or away from resonance, make that the energy exchange between resonant object and the external object is very little, so can remove the item K in the formula (1)
12Resonant object a
1The suitable analytical model of the field amplitude (t) becomes:
Just, the influence of external object just produces disturbance to the resonance of resonant object, and it has two aspects: the first, and it passes through k
11Its resonance frequency of real part skew, thereby make it and other resonant object off resonances.This is a problem that is easy to overcome, and by each equipment is used feedback mechanism, each equipment is for example corrected its frequency by the minor alteration of geometry, and makes the frequency match in frequency and source.The second, it makes resonant object loss mode energy, and this loss is because the energy that makes scattering by the polarization that induces in the external object or electric current radiate from external object, and owing to passes through k in the external object
11The absorbed of imaginary part.The function that reduces for the energy delivery scheme of this Q is injurious effects, because can not remedy it, so must quantize its amplitude.
In first example of the resonant object of having considered, dielectric disks, little, low index, low spillage of material or this class object of spuious object far away will cause very little scattering and absorption.Reduce the reality that Q can be more dangerous in order to check, " test " dielectric disks chamber 40 can be placed to and approach: (a) another off-resonance object 42, such as human body, shown in Fig. 4 A, object 42 has big Re{ ε }=49 and Im{ ε=16, and have identical size and different shapes; (b) rough surface 46, and such as wall, shown in Fig. 4 B, object 46 has big expanded range, but have a little Re{ ε }=2.5 and Im{ ε=0.05.
Analytically, for the interactional object of little disturbance, the value of the radiation Q that reduces owing to scattering can be used outside object X=42 or the resonant cavity 1 caused polarization in the rough surface X=46
Estimate.Because in situation about being studied, the refractive index of external object or size are very big, these single order perturbation theories result's accuracy is not enough, thereby can only rely on numerical value FDTD emulation.Can pass through
Estimate the absorption Q of these object inside.
Use these methods, the distance D/r=10,7,5,3 between chamber and the external object center can find Q
Radiation=1992 are reduced to Q respectively
Radiation=1988,1258,702,226, and the absorption rate of this object inside is Q
Absorb=312530,86980,21864,1662, just, the resonance in this chamber can not be subjected to the harmful interference of external object high target and/or high loss, unless (might move) object and this chamber are very approaching.For the distance D/r=10 between chamber and the rough surface, 7,5,3, we find Q
Radiation=2101,2257,1760,1110,572 and Q
Absorb4000, just,, also low to the acceptable degree to the influence of initial resonance mode even when the chamber is embedded under this lip-deep extreme case.Notice near metal object also scattering resonance field significantly, but can not have such object in order to simplify hypothesis.
The system of a kind of combination of imagination now wherein, uses source of resonant excitation object s to resonance device object d wireless transmission energy, but has an off-resonance external object e.Can see, from the intensity of all external loss mechanism of e by | E
S(r
e) |
2Determine, promptly by at the position of this external object r
eSquare determining of the little amplitude of the trace of this source of resonant excitation that the place is calculated.Relative with it, the coefficient of the resonance coupling of the energy from the source to equipment is by at the position of this equipment r
dThe trace amplitude of the phase same order that the place is calculated | E
S(r
d) | determine, but not current do not use square.Therefore, arrive the equidistance of external object to equipment and source for the source, the coupling time that is used for carrying out with equipment energy exchange is accumulated the needed time much smaller than the loss in the external object, especially when the amplitude of resonant fields has the decay of the similar index that begins from the source.In fact can optimize performance, make by design system and utilize trace less and the coupling that long trace obtains to wish at the equipment place, thereby make the minimum interference of other objects the source at the place, source.
Above-mentioned notion can be verified under the situation in dielectric disks chamber by emulation, Fig. 2 A-2B and 4A-4B have been made up in this emulation, just, two (source-equipment) " test " chambeies 50 are placed to separately 10r, the external object 52 that between them, has the same size of ε=49, and the distance apart from the big rough surface 56 of ε=2.5 is 5r, as shown in Figure 5.So, thus initial value Q=1992, ω/2k=1717(k/ Γ=1.16) thereby worsen be Q=765, ω/2k=965(k/ Γ=0.79).Consider the degree of the external disturbance of being concerned about, this change is very little, is acceptable, and because also this system design is not optimized, can be used for energy delivery so the end value of coupling-loss ratio has guaranteed this scheme.
In second example of the resonant object of being considered, for conductor loop, external object exists hardly to the influence of resonance.Reason is, the quasi-stable state field operation of being considered (r<<λ) in because electric field is confined to capacitor inside, so the near field in this ring ambient air zone mainly is a magnetic.Therefore, can with this field interactions and produce external object to the disturbance of resonance be those objects with remarkable magnetic (magnetic permeability Re{ μ }〉1 or magnetic loss Im{ μ 0).Because nearly all common material is not magnetic, they are the same with free space to the response in magnetic field, thus resonance that can the interfere with guidewire ring.Unique disturbance that expection can influence these resonance is near big metal structure.
The most important hint of the above fact relates to the security consideration of human body.Human body neither magnetic, can resist high-intensity magnetic field and can not suffer any danger.This obviously is the advantage of this class resonator system for many real world applications.On the other hand, the dielectrics systems of high (effectively) index has the following advantages: the efficient of judging them from the higher k/ Γ value that is obtained is higher; As previously mentioned, they can also be applied to much smaller length dimension.
Consider now combined system once more at situation resonant source s that has human body h and wall and equipment d, let us research now when equipment just at consumed energy when being used for operation element, this is based on the efficient of the energy delivery scheme that resonates.Can use the parameter that finds previously: for dielectric disks, the main loss Q that is absorbed as at the place, source
s~10
4, the radiation at the equipment place is main loss Q
d~10
3(it comprises from the scattering of human body and wall), at the absorption Q of human body to source and plant capacity
S-h, Q
D-h~10
4-10
5Insignificant absorption loss in (depending on the non-closely approaching distance of human body), the wall apart from these objects; For conductor loop, Q
s~Q
d~10
3, and be insignificant from the disturbance of human body and wall.Utilize corresponding loss speed Γ=ω/2Q, depend on the coupling k of distance and the speed Γ of extraction operating power
w, the coupled-mode theory equation of this equipment field amplitude is:
Current different scheme can be used for slave unit and extract power, and their efficient shows the different dependence of system parameters to combination.Here, can suppose steady state, make the field amplitude of inside, source keep constant, i.e. a
s(t)=A
se
-i ω t, the field amplitude of this device interior is a so
d(t)=A
de
-i ω t, A wherein
d=ik/ (Γ
d+ Γ
D-h+ Γ
w) A
sTherefore, the power loss at place, source is P
s=2 Γ
s| A
s|
2, the power loss at equipment place is P
d=2 Γ
d| A
d|
2, be P in human body place power absorbed
h=2 Γ
S-h| A
s|
2+ 2 Γ
D-h| A
d|
2, the available power of being extracted is P
w=2 Γ
w| A
d|
2According to the conservation of energy, the gross power that enters this system is P
Total=P
s+ P
d+ P
h+ P
wWith the total losses rate representation be
With
According to related application, should be with the consumption in operation rate selection
Minimizing the institute's energy requirement that is stored in the resonant object, or be chosen as
Make that the available power and the ratio of loss power (are efficiency eta
w=P
w/ P
Total) maximum for certain k value.More than the efficiency eta of two kinds of different choice respectively shown in Fig. 6 A and the 6B, it is k/ Γ
dThe function of quality factor, k/ Γ
dQuality factor depend on source-equipment distance.
Fig. 6 A and 6B show the selection for system of dielectric disks and optimization efficiency, and efficient can be very big, for example, is at least 40%.For value k/ Γ
d1 and Q
h10
5, promptly for middle distance source-equipment distance (D
d/ r<10) and most of human body-source/equipment distance (D
h/ r〉8), the energy dissipation of inside of human body is enough little, less than 5%.For example, for D
d/ r=10 and D
h/ r=8 gives load if must transmit 10W, can see according to Fig. 6 B so, will have~0.4W is dissipated in the human body, and~4W is by the source absorbed inside, and~2.6W is radiated free space.For the conductor loop system, resulting efficient is littler, and it is for k/ Γ
d≈ 1 is~20%, but significant advantage is not have energy dissipation in human body, as previously explained.
By optimizing the resonant object design, can also obtain more performance.In addition, by the interference effect between the radiation field that adopts foregoing coupling object,, can further improve the total system function such as the operation of the continuous wave under the frequency with normal mode of large radiation Q more.Thereby the wireless energy transfer scheme of this innovation can be used for many modern Application.Though all considerations are all made at static geometry, all results can directly apply to the dynamic geometry structure of mobile object, because energy delivery time k
-1~1 μ s is much smaller than any time yardstick that is associated with the motion of macroscopic objects.
The invention provides a kind of scheme that the middle distance wireless non-radiative energy transmits that is used for based on resonance.The analysis of very simple realization geometry is provided the challenging performance characteristics of the potential applicability of proposed scheme.For example, in macrocosm, this scheme can be used for to the automaton of factory room and/or computer transmitted power, or the electrobus on highway (in this case, source-resonant cavity extends " pipeline " on highway) transmitted power.In microcosmos, can use much smaller wavelength and need littler power, at this moment can use this scheme to realize that the optics of CMOS electronic device is interconnected, or use this scheme to transmit energy to automatic nanometer object (nano-object), and do not need to worry very much alignment problem relative between source and the equipment; Energy delivery distance even can be longer than object size, this is because the Im{ ε (ω) of dielectric substance } at required optical frequency than much smaller in microwave frequency.
As the starting point of future science research, the different material system of research aspect performance and the different range of application should improved.For example, by exploitation plasma system (plasmonic system), might significantly improve performance.These systems can have usually than the changing in their lip-deep spatial field of free space wavelength much shorter, and this exactly feature allows required scale to separate: resonant object can be significantly less than its trace that is similar to index.In addition, can also investigate the application of using acoustic resonance, wherein the source is connected via public condensed state matter (condensed-matter) object with equipment.
Though according to several preferred embodiments of the present invention explanation with described the present invention,, can make various changes, delete, add to form of the present invention and details without departing from the spirit and scope of the present invention.
Claims (69)
1. the method for a wireless transmission electromagnetic energy comprises:
Be provided for first resonator structure from the external power source received energy, described first resonator structure has first quality factor q
1, and,
Second resonator structure is being provided and is supplying available operating power to external loading away from the position of described first resonator structure distance for D, described second resonator structure has second quality factor q
2,
The coupling of the resonant fields fadout trace by described first resonator structure and described second resonator structure is transmitted non-radiative energy between described first resonator structure and described second resonator structure,
Wherein, described first resonator structure is for low inherent loss speed Γ
1Use has high Q
1=ω
1/ (2 Γ
1) resonance mode be used for the non-radiative energy transmission, described second resonator structure is for low inherent loss speed Γ
2Use has high Q
2=ω
2/ (2 Γ
2) resonance mode be used for non-radiative energy transmission, ω
1And ω
2Be respectively the resonance frequency of described first resonator structure and the resonance frequency of described second resonator structure, and
Wherein, described distance D is less than the resonant wavelength λ 1 of described first resonator structure and the resonant wavelength λ of described second resonator structure
2
2. method according to claim 1, wherein, Q
1100, and Q
2100.
3. method according to claim 1, wherein,
4. method according to claim 1, wherein, the fadout trace that described resonance mode has is than the size L of described two resonator structure
1And L
2Significantly will grow, and can realize high energy transfer efficiency to the described distance D between described first resonator structure and described second resonator structure, wherein, described high energy transfer efficiency comprises
And D/L
21, and k represents the rate of energy transfer between described first resonator structure and described second resonator structure.
5. method according to claim 1, wherein, described second resonator structure is the part of mobile radio receiver.
6. method according to claim 5, wherein, described mobile radio receiver is the one of any of automaton, vehicle or computer.
7. method according to claim 1 also comprises and uses the resonance that feedback mechanism mates described first resonator structure and described second resonator structure.
8. method according to claim 1, wherein, with between 5MHz and the 380MHz and comprise that the resonance frequency of 5MHz and 380MHz drives described first resonator structure and described second resonator structure.
9. method according to claim 4, wherein, D/L
22.
10. method according to claim 9, wherein, D/L
23.
11. method according to claim 10, wherein, D/L
25.
12. method according to claim 4, wherein,
13. method according to claim 12, wherein, D/L
22.
14. method according to claim 13, wherein, D/L
23.
15. method according to claim 14, wherein, D/L
25.
17. method according to claim 16, wherein, D/L
22.
18. method according to claim 17, wherein, D/L
23.
19. method according to claim 18, wherein, D/L
25.
21. method according to claim 20, wherein, D/L
22.
22. method according to claim 21, wherein, D/L
23.
23. method according to claim 22, wherein, D/L
25.
25. method according to claim 24, wherein, D/L
22.
26. method according to claim 25, wherein, D/L
23.
27. method according to claim 26, wherein, D/L
25.
28. method according to claim 1, wherein, described resonance mode can realize high energy transfer efficiency to the described distance D between described first resonator structure and described second resonator structure, and wherein, described high energy transfer efficiency comprises Q
2100.
29. method according to claim 4, wherein, described high energy transfer efficiency comprises Q
2100.
30. an electromagnetic energy wireless transmission equipment comprises:
Be used for first resonator structure from the external power source received energy, described first resonator structure has first quality factor q
1, and use with second resonator structure,
Described second resonator structure is provided with in the position that is D away from described first resonator structure distance and to the available operating power of external loading supply, described second resonator structure has second quality factor q
2,
Wherein, the non-radiative energy transmission between described first resonator structure and described second resonator structure is to be undertaken by the coupling of their resonant fields fadout trace,
Wherein, described first resonator structure is for low inherent loss speed Γ
1Use has high Q
1=ω
1/ (2 Γ
1) resonance mode, described second resonator structure is for low inherent loss speed Γ
2Use has high Q
2=ω
2/ (2 Γ
2) resonance mode be used for non-radiative energy transmission, ω
1And ω
2Be respectively the resonance frequency of described first resonator structure and the resonance frequency of described second resonator structure, and
Wherein, described distance D is less than the resonant wavelength λ 1 of described first resonator structure and the resonant wavelength λ of described second resonator structure
2
31. equipment according to claim 30, wherein, Q
1100, and Q
2100.
33. equipment according to claim 30, wherein, described resonance mode can realize high energy transfer efficiency to the described distance D between described first resonator structure and described second resonator structure, and wherein, described high energy transfer efficiency comprises Q
1100.
34. equipment according to claim 30, wherein, the fadout trace that described resonance mode has is than the size L of described two resonator structure
1And L
2Significantly to grow, and wherein,
And D/L
21, and k represents the rate of energy transfer between described first resonator structure and described second resonator structure.
35. equipment according to claim 30, wherein, described first resonator structure comprises the conductor loop of capacity load, and the radius of wherein said ring is L
1
36. equipment according to claim 30, wherein, described second resonator structure is the part of mobile radio receiver.
37. equipment according to claim 36, wherein, described mobile radio receiver is the one of any of automaton, vehicle or computer.
38. equipment according to claim 30 also comprises feedback mechanism, is used to mate the resonance of described first resonator structure and described second resonator structure.
39. equipment according to claim 30 also comprises described external power source, described first resonator structure is from described external power source received energy.
40. equipment according to claim 30, wherein, described first resonator structure and described second resonator structure are configured to between 5MHz and the 380MHz and comprise that the resonance frequency of 5MHz and 380MHz drives.
41. equipment according to claim 34, wherein, D/L
22.
42. according to the described equipment of claim 41, wherein, D/L
23.
43. according to the described equipment of claim 42, wherein, D/L
25.
45. according to the described equipment of claim 44, wherein, D/L
22.
46. according to the described equipment of claim 45, wherein, D/L
23.
47. according to the described equipment of claim 46, wherein, D/L
25.
49. according to the described equipment of claim 48, wherein, D/L
22.
50. according to the described equipment of claim 49, wherein, D/L
23.
51. according to the described equipment of claim 50, wherein, D/L
25.
53. according to the described equipment of claim 52, wherein, D/L
22.
54. according to the described equipment of claim 53, wherein, D/L
23.
55. according to the described equipment of claim 54, wherein, D/L
25.
57. according to the described equipment of claim 56, wherein, D/L
22.
58. according to the described equipment of claim 57, wherein, D/L
23.
59. according to the described equipment of claim 58, wherein, D/L
25.
60. equipment according to claim 30, wherein, described resonance mode can realize high energy transfer efficiency to the described distance D between described first resonator structure and described second resonator structure, and wherein, described high energy transfer efficiency comprises Q
2100.
61. equipment according to claim 33, wherein, described high energy transfer efficiency comprises Q
2100.
62. an electromagnetic energy wireless transmission equipment uses with first resonator structure from the external power source received energy, described first resonator structure has first quality factor q
1, described energy wireless transmission equipment comprises:
Second resonator structure is provided with in the position that is D away from described first resonator structure distance and to the available operating power of external loading supply, described second resonator structure has second quality factor q
2,
Wherein, the non-radiative energy transmission between described first resonator structure and described second resonator structure is to be undertaken by the coupling of their resonant fields fadout trace,
Wherein, described first resonator structure is for low inherent loss speed Γ
1Use has high Q
1=ω
1/ (2 Γ
1) resonance mode, described second resonator structure is for low inherent loss speed Γ
2Use has high Q
2=ω
2/ (2 Γ
2) resonance mode be used for non-radiative energy transmission, ω
1And ω
2Be respectively the resonance frequency of described first resonator structure and the resonance frequency of described second resonator structure,
Wherein said distance D is less than the resonant wavelength λ 1 of described first resonator structure and the resonant wavelength λ of described second resonator structure
2
63. according to the described equipment of claim 62, wherein, described second resonator structure comprises the conductor loop of capacity load, the radius of described ring is L
2
64. according to the described equipment of claim 62, wherein, Q
1100, and Q
2100.
66. according to the described equipment of claim 62, described second resonator structure is the part of mobile radio receiver.
67. according to the described equipment of claim 66, wherein, described mobile radio receiver is the one of any of automaton, vehicle or computer.
68. according to the described equipment of claim 62, also comprise feedback mechanism, be used to mate the resonance of described first resonator structure and described second resonator structure.
69. according to the described equipment of claim 62, wherein, described first resonator structure and described second resonator structure are configured to between 5MHz and the 380MHz and comprise that the resonance frequency of 5MHz and 380MHz drives.
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CN101860089B (en) | 2005-07-12 | 2013-02-06 | 麻省理工学院 | Wireless non-radiative energy transfer |
EP1921980A4 (en) | 2005-08-31 | 2010-03-10 | Univ Virginia | Improving the accuracy of continuous glucose sensors |
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